Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6afcaa84fb62f9…

MALICIOUS

PDF

37.7 KB Created: 2020-08-06 09:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bc2f4a6e0ea861eb7ef8db1e9bc4fd0 SHA-1: 38073af7fa14ecbd868563917a27c5b3c3bab5eb SHA-256: bf6afcaa84fb62f9d15adf538f7c4a8eeee4a1be57ca4e2237ce2130a9c771e9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass of external links, with one identified as a malicious redirector. The primary malicious URL is https://ttraff.ru/pify?keyword=glencoe+precalculus+student+edition+advanced+math+concepts+pdf, which likely serves as a gateway to further malicious content. The presence of numerous PDF links, many pointing to Shopify domains, suggests a link farm or SEO poisoning tactic to distribute malicious documents. No scripts were extracted, and the document body is heavily obfuscated.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=glencoe+precalculus+student+edition+advanced+math+concepts+pdf
    • http://files.danniallethomas.com/uploads/1/3/1/4/131408056/miviwijopogev.pdf
    • http://files.yunkawasiperu.org/uploads/1/3/1/3/131379612/vizarifogumawov.pdf
    • http://seginijuv.semoswatchallenge.com/uploads/1/3/1/3/131380429/5575839.pdf
    • http://dowuja.miltronicsinc.com/uploads/1/3/0/9/130969045/8818763.pdf
    • http://files.jghsmarchingeagles.org/uploads/1/3/0/7/130775867/6012816.pdf
    • https://cdn.shopify.com/s/files/1/0432/2174/5822/files/arema_manual_for_railway_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0448/1266/4989/files/ultimate_marvel_vs_capcom_3_characters_list.pdf
    • https://cdn.shopify.com/s/files/1/0441/0766/1464/files/hustler_mower_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/3545/7698/files/insanity_workout_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/3884/2779/files/vawurirejituxi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4909/0200/files/14202189020.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/bedetuwimulivulasorakulif.pdf
    • https://cdn.shopify.com/s/files/1/0437/7031/4903/files/zigovesufefuzijusu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2962/4992/files/bufixiw.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/29577333784.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9080/files/32671686417.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9812/files/72789294398.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005426.bin
768a87980f0465c6bc3099df43f93e4889f5d176dfce9a68edc3533ef27d8f2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5426 5484 bytes
font_01_sfnt_off000066b0.bin
592116643126b70593f2c8035a516fd1558fc95c53dc9aabf8719c135c5a31b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66B0 10164 bytes

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